Hi,
After paying 220$ to get a scan done on our brake system I bit the bullet and purchased the Wabco Toolbox software and Nex IQ scanner.
Anytime we got a brake alert we did not know if it was major issue or just an alert, also it's getting hard to find shops with the software.
I had an old mini laptop which I repurposed for this. I have it velcroed in place.